Its a simple fact that in order to live we have to get oxygen into our blood. To this effect we inhale air into our lungs. But that in itself is not enough. Somehow the body has to get the oxygen that is in the air into our blood and in sufficient quatity. To do this our lungs have, over millenia evolved. each lung contains millions of liitle air sacs that look like bunches of grapes. These little air sacs are called alveoli. They act to increase the surface area of each lung and therefore increase the amount of blood that can absorb oxygen in one breath.
Together, the millions of alveoli of the lungs form a surface of more than 100 square meters. Within the alveolar walls is a dense network of tiny blood vessels called capillaries. The extremely thin barrier between air in our lungs and the capillaries allows oxygen to move from air in the alveoli into the blood and allows carbon dioxide to move from the blood in the capillaries into the alveoli. Without them the lungs would have to be many times larger than they actually are to absorb the amount of oxygen the body needs.
Cilia are the tiny hairs that sweep dust and dirt out of the respiratory system.
Your question is unclear. Are you asking what does the most in the respiratory system , then tiny little sacs called the alveoli do.
The insect respiratory system operates by passive exchange of gasses through tiny holes called spiracles in their abdomen.
ok, think of your lungs as a cluster of grapes hanging upside down. The smallest branches are called bronchioles . At the end of each bronchiole is an "air sac" called alveoli .
alveoli
Cilia are tiny hair-like projections from the apical cells of the respiratory system. They beat in an upward direction to push mucous and any trapped substances out of the lungs.
The respiratory looks like an upside down tree, from the trunk to the branches and to fruit (such as an apple). From largest to smallest, the respiratory system consists of the throat to main bronchi, to bronchioles, to terminal bronchioles, to alveolar ducts, to alveolar sacs (aveoli look like tiny grapes).
As you breathe through your nose, it will go through the windpipe and into your lungs. It will go through tiny holes in the lungs. The wastes will get out from the tiny holes into your windpipe and you breathe them out.
some things that are part of the lungs and respiratory system
A birds bones has tiny air sacks throughout them. All of the sacks are connected to the lungs.
There are tiny hairs in your windpipe that pick up the pieces of dirt and move them to the "Disposal unit"
You do not have any such cubes in your respiratory system.